<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>2_回调函数形式的ref</title>
</head>
<body>
    	<!-- 准备好一个“容器” -->
	<div id="test"></div>
	
	<!-- 引入react核心库 -->
	<script type="text/javascript" src="../js/react.development.js"></script>
	<!-- 引入react-dom，用于支持react操作DOM -->
	<script type="text/javascript" src="../js/react-dom.development.js"></script>
	<!-- 引入babel，用于将jsx转为js -->
	<script type="text/javascript" src="../js/babel.min.js"></script>
    <script type="text/babel">
        class Demo extends React.Component{
            showData=()=>{
                console.log(this)
                const {input1}=this
                alert(input1.value)
            }
            showData2=()=>{
                const {input2}=this
                alert(input2.value)
            }
            render(){
                // (c)=>{this.input1=c} 匿名函数 
                // (c)=>{this.input1=c}  函数只有一行的时候可以简写为 c=>this.input1=c
                // onBlur 失去焦点的回调函数
                return <div>
                        <input ref={c=>this.input1=c} type="text"  placeholder="点击按钮提示数据"/>&nbsp;
                        <button onClick={this.showData}>点我提示左侧的数据</button>
                        <input ref={c=>this.input2=c} type="text" onBlur={this.showData2} placeholder="失去焦点提示数据"/>
                    </div>
            }
        }

        ReactDOM.render(<Demo/>,document.getElementById('test'))
    </script>
</body>
</html>